This are a few
trackers that I consider low level, not really because of content but because of how easy is to get an invite or simply register.
Hdme, Karagarga, Bit-hdtv, AnimeByt.es, Brokenstones, Bitspyder,
Bithq, Gazellegames, Jpopsuki, Sport-Scene, Underground-Gamer, TheHorrorChannel, etc.
There are others that I've heard of but don't really care and some others that I've never heard of and they probably are not that great, although I could be wrong.
Like I said you can get an invite here to most of those sites and from there on to all others.